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Self-assembled multilayer films containing TiO2 and chitosan (CS) were prepared using layer-by-layer method (LbL). The composite film fabricated on quartz and fluorine-doped tin oxide substrates was investigated using UV-vis spectroscopy, scanning electron microscopy (SEM), cyclic voltammetry (CV) and in situ chronoamperometric (CA) electrochemical measurements. The results of the UVvis spectra confirm the uniformity of each deposition cycles. The electrochemical behavior of TiO2 has the typical property of a surface-confined electrochemical process. The composite film displays high electrochromic performance, with the coloration efficiency 33.3 cm/C of and optical contrast of 17.1% at 800 nm. Furthermore, the film achieved a fast switching speed of 6.0 s and 0.5 s for coloration and bleaching, respectively. The composite material undergoes transitions from colorless to dark blue when the potential is switched from +2 V to -2 V. The electrochromic performance of the LbL film containing TiO2 and CS indicates that this material is highly beneficial in view of an application in electrochromic devices. KeywordsElectrochromic; TiO2; Chitoasn;Layer-bylayer; coloration efficiency

Enhanced Coloration Efficiency of Electrochromic Thin Film Based on TiO2 and Chitosan